package com.aacar.utils;

import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.io.OutputStream;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.HashMap;
import java.util.Map;

import javax.imageio.ImageIO;
import javax.swing.filechooser.FileSystemView;

import com.google.zxing.BarcodeFormat;
import com.google.zxing.EncodeHintType;
import com.google.zxing.MultiFormatWriter;
import com.google.zxing.common.BitMatrix;

/**
 * 根据url 生成二维码
 * @author Administrator
 *
 */
public class QrCodeUtil {
	
	 public static void main(String[] args) {
//	        String url = "http://120.55.63.211:8018/downloads/apk/aacar-release.apk";
		 	String url = "http://120.55.63.211:8018/downloads/download.html";
	        String path = FileSystemView.getFileSystemView().getHomeDirectory() + File.separator + "testQrcode";
	        String fileName = new SimpleDateFormat("yyyyMMddHHmmss").format(new Date()) + ".jpg";
	        createQrCode(url, path, fileName);
	    }
	 
	    public static String createQrCode(String url, String path, String fileName) {
	        try {
	            Map<EncodeHintType, String> hints = new HashMap<>();
	            hints.put(EncodeHintType.CHARACTER_SET, "UTF-8");
	            BitMatrix bitMatrix = new MultiFormatWriter().encode(url, BarcodeFormat.QR_CODE, 400, 400, hints);
	            File file = new File(path, fileName);
	            if (file.exists() || ((file.getParentFile().exists() || file.getParentFile().mkdirs()) && file.createNewFile())) {
	                writeToFile(bitMatrix, "jpg", file);
	                System.out.println("搞定：" + file);
	            }
	 
	        } catch (Exception e) {
	            e.printStackTrace();
	        }
	        return null;
	    }
	 
	    static void writeToFile(BitMatrix matrix, String format, File file) throws IOException {
	        BufferedImage image = toBufferedImage(matrix);
	        if (!ImageIO.write(image, format, file)) {
	            throw new IOException("Could not write an image of format " + format + " to " + file);
	        }
	    }
	 
	    static void writeToStream(BitMatrix matrix, String format, OutputStream stream) throws IOException {
	        BufferedImage image = toBufferedImage(matrix);
	        if (!ImageIO.write(image, format, stream)) {
	            throw new IOException("Could not write an image of format " + format);
	        }
	    }
	 
	    private static final int BLACK = 0xFF000000;
	    private static final int WHITE = 0xFFFFFFFF;
	 
	    private static BufferedImage toBufferedImage(BitMatrix matrix) {
	        int width = matrix.getWidth();
	        int height = matrix.getHeight();
	        BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
	        for (int x = 0; x < width; x++) {
	            for (int y = 0; y < height; y++) {
	                image.setRGB(x, y, matrix.get(x, y) ? BLACK : WHITE);
	            }
	        }
	        return image;
	    }
}
